No time to tinker as van Marwijk focuses on performance

Bert van Marwijk will shun experimentation in a friendly which could provide the first real window into how the Caltex Socceroos will shape up at the FIFA World Cup.

The Dutchman would not discuss which players he was considering for the clash with Czech Republic in St Polten, Austria on Friday (9:00pm AEST) but did reveal he had "60-70 per cent" of his starting XI in mind.

Tomi Juric is not out of the running to gain minutes after recently returning to training, while captain Mile Jedinak has joined his team-mates on the track following the Championship play-off final last weekend.

Van Marwijk has regularly stressed the importance of his players having the self-confidence and trust in their team-mates to make individual decisions within the tactical framework he hopes will carry Australia to the knockout stages in Russia.

That approach will be put to the test against a Czech side which has proved tricky to assess.

"We analysed them. But every game they play in a different organisation with different players, so it's difficult," he said.

"On the other side it's good because we try to learn to play in a way that we aren't dependant on the organisation of the opponent.

Much of the squad has been in camp for almost two weeks.

"We have to play in our same organisation. In the same organisation you can also have variations.

"When for example Rogic and Irvine play in the same position, it's completely different. It's the same when, for example, Mooy and Jedinak play in the same control position in the midfield.

"Then you get another type of playing but your organisation is the same."